package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1、获取本次诗求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2、判断不次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4.1判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录,用户ID为：{}",request.getSession().getAttribute("employee"));
            Long ids = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(ids);

            long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        //4.2判断登录状态，如果已经登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录,用户ID为：{}",request.getSession().getAttribute("user"));
            Long userid = (Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userid);

//            long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5、如果未登录则返回未登录结果

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
            return;
//        log.info("拦截到请求：{}",request.getRequestURI());
//        filterChain.doFilter(request,response);
    }

    /**
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }

}
